Prince William and Catherine, Duchess of Cambridge, show their newborn son to the world's media. Photo: AFP

The Archbishop of Canterbury, the Most Reverend Justin Welby, will be christen Prince George at The Chapel Royal at St James's Palace, on Wednesday, October 23rd.

The new 'conjugal coat of arms' has Prince William's shield on the left, which features various royal emblems of different parts of the United Kingdom - the three lions of England, the lion of Scotland and the harp of Ireland.

Prince George of Cambridge: the royal baby finally has a name. Photo: AFP

It is surrounded by a blue garter bearing the motto Honi soit qui mal y pense, which means 'Shame to those who think evil of it'. The saying symbolises the Order of the Garter, of which The Duke is a Knight Companion.

In keeping with tradition it also features the shield of the Middleton family, which was granted in 2011, ahead of the royal marriage.

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The Duchess of Cambridge's shield, on the right side, is divided vertically, with one half blue and the other half red, and includes a gold chevron across the centre with white "cotises" either side.

It features three acorns that the duches, and her siblings Pippa and James, with gold stalks and leaves.

Coat of Arms: The new Conjugal Coat of Arms for Prince William, Duke of Cambridge, his wife Catherine, Duchess of Cambridge, which will represent them in heraldic terms as a married couple. Photo: AFP/KENSINGTON PALACE

"The Conjugal Arms will be theirs forever, however as their circumstances and roles alter, elements of the accoutrements around the shields may change," Kensington Palace said in a statement. "In addition to their Conjugal Arms, Their Royal Highnesses also retain their own Coats of Arms to represent themselves as individuals."

The Duchess of Cambridge was also granted her own Coat of Arms by The Queen after her marriage. It was made by placing her father's Arms beside those of her husband in what is known as an impaled Coat of Arms.